Fiber optic connectors having an internal compliant member to compensate for tolerance stack-up of components

ABSTRACT

Fiber optic connectors are disclosed that may compensate for the tolerance stack-up of components. The fiber optic connector comprises a connector assembly, a body for securing a portion of the connector assembly, an internal compliant member, a connector sleeve assembly, a balancing resilient member, and a housing. The internal compliant member is disposed about a portion of the body and may compensate for tolerance stack-up of components when the fiber optic connector is assembled. The connector assembly comprises a ferrule and a resilient member for biasing the ferrule forward and the connector sleeve assembly comprises a housing and a ferrule sleeve. When assembled, the connector assembly is at least partially disposed in the passageway of the housing and the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve. The balancing resilient member biases the housing of the connector sleeve assembly to a forward position.

RELATED APPLICATIONS

This application claims the benefit of priority under 35 U.S.C. § 119 of U.S. Provisional Application Ser. No. 62/928,421 filed on Oct. 31, 2019, the content of which is relied upon and incorporated herein by reference in its entirety.

BACKGROUND

The disclosure is directed to fiber optic connectors that compensate for tolerance stack-up of components of the fiber optic connectors. More specifically, the disclosure is also directed to fiber optic connectors having an internal compliant member to compensate for the tolerance stack-up of components in an axial direction.

Optical fiber is increasingly being used for a variety of applications, including but not limited to broadband voice, video, and data transmission. As bandwidth demands increase optical fiber is migrating toward subscribers in outdoor communication networks such as in fiber to the premises applications such as FTTx and the like. To address this need for making optical connections in communication networks for the outside the plant environment hardened fiber optic connectors were developed. One of the most commercially successful hardened fiber optic connectors is the OptiTap® male plug connector sold by Corning Cable Systems, LLC of Hickory, N.C., such as disclosed in U.S. Pat. Nos. 7,090,406 and 7,113,679 (the '406 and '679 patents) and incorporated herein by reference. The Optitap® connector is a hardened male plug connector for terminating a cable that is configured for optical connection using a receptacle. As used herein, the term “hardened” describes a connector or receptacle port intended for making an environmentally sealed optical connection suitable for outdoor use, and the term “non-hardened” describes a connector or receptacle port that is not intended for making an environmentally sealed optical connection such as a SC connector.

The hardened connector such as the OptiTap may mated with another connector using a receptacle or adapter that receives a separate connector on each end for making an optical connection. Receptacles or adapters may be mounted on the wall of a box or bulkhead, and thus require three distinct assemblies for making an optical connection (e.g., a first connector, receptacle or adapter, and a second connector) as well-known in the art.

FIGS. 1A-1C are prior art depictions showing various stages of mating of a preconnectorized cable 10 having a plug connector 5 such as an OptiTap® connector with a receptacle 30. Receptacle 30 mates plug connector 5 with a standard SC connector (i.e., a non-hardened connector) at a second end (not visible in these views) using an adapter sleeve for aligning ferrules when mating plug connector 5 with the non-hardened connector. Protection of the non-hardened connector side of the receptacle is typically accomplished by mounting the receptacle 30 through a wall of an enclosure or the like so that the non-hardened end of the receptacle is disposed inside the enclosure for environmental protection of the non-hardened connector. As shown by FIGS. 1A-1C, the other end of the receptacle 30 is accessible for receiving the plug connector 5 at the wall of the enclosure. Other applications may mount the receptacle 30 inside an enclosure on a bracket or the like.

Receptacle 30 allows an optical connection between the hardened connector such as the OptiTap® male plug connector with a non-hardened connector such as the SC connector at nodes in the optical network that typically transition from an outdoor space to an indoor space. FIG. 2 depicts an exploded view of receptacle 30, which is described in further detail in U.S. Pat. No. 6,579,014. As depicted, receptacle 30 includes a receptacle housing 12 and an adapter sleeve 18 disposed therein. The receptacle 30 receives a non-hardened connector at a second end 16 as represented by the arrow pointing to the left Adapter sleeve 18 is biased toward a first end 14 of the receptacle 30 that receives the connector 5 using springs 38. This biasing of the adapter sleeve 18 toward the first end 14 that receives the plug connector 5 is used for maintaining physical ferrule-to-ferrule contact between the plug connector and the SC connector to increase the “float” between the mating ferrules. When mated, the ferrule of the plug connector 5 is not latched to the adapter sleeve and springs 38 of receptacle 30 are used for increasing the “float” between the mating ferrules of the plug connector and the non-hardened connector and is used because.

Network operators often desire to optically connect a first hardened connector to another hardened connector in a space that requires a rugged connection point, which receptacle 30 is incapable of accomplishing. Consequently, there exists an unresolved need for fiber optic connectors that can mate directly with to another hardened connector in a quick and reliable manner while providing a ruggedized solution that preserves optical performance.

SUMMARY

The disclosure is directed to ferrule-based fiber optic connectors comprising an internal compliant member disposed about a body that secures or holds a portion of the connector assembly directly. The internal compliant member is useful for compensating for the tolerance stack-up of components within the connector. The concepts disclosed are useful for female hardened fiber optic connectors that mate directly to hardened plug connectors. As an example, the concepts are useful with a female hardened connector that mates with an OptiTap® hardened male plug connector, but other applications for the concepts disclosed are possible and advantageous as well. Thus, the concepts also allow a compact footprint for fiber optic connectors since the spatial arrangement is more compact than the prior art.

One aspect of the disclosure is directed to a fiber optic connector comprising a connector assembly comprising a connector assembly body, a ferrule and a resilient member for biasing the ferrule forward, a body for securing a portion of the connector assembly, an internal compliant member, a connector sleeve assembly, a balancing resilient member and a housing comprising a threaded portion. The internal compliant member is disposed about a barrel portion of the body and abutting a shoulder of the body. The connector sleeve assembly comprises a housing with a passageway between a first end and a second end along with a ferrule sleeve. When assembled, the connector assembly is at least partially disposed in a passageway of the housing and the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve. The balancing resilient member for biasing the housing to a forward position.

Another aspect of the disclosure is directed to a fiber optic connector comprising a connector assembly comprising a connector assembly body, a ferrule and a resilient member for biasing the ferrule forward, a body for securing a portion of the connector assembly, an internal compliant member, a connector sleeve assembly, a balancing resilient member, and a housing comprising a threaded portion with internal threads. The internal compliant member is disposed about a barrel portion of the body and abutting a shoulder of the body. The connector sleeve assembly comprises a housing with a passageway between a first end and a second end along with a ferrule sleeve. When assembled, the connector assembly is at least partially disposed in a passageway of the connector sleeve assembly and the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve.

Still another aspect of the disclosure is directed to a fiber optic connector comprising a connector assembly comprising a connector assembly body, a ferrule and a resilient member for biasing the ferrule forward, a body for securing a portion of the connector assembly, an internal compliant member, a connector sleeve assembly, a balancing resilient member, and a female coupling housing comprising an opening having a threaded portion. The internal compliant member is disposed about a barrel portion of the body and abutting a shoulder of the body. The connector sleeve assembly comprises a housing with a passageway between a first end and a second end along with a ferrule sleeve and a latch. When assembled, the connector assembly is at least partially disposed in a passageway of the connector sleeve assembly and the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve. The balancing resilient member for biasing the housing to a forward position with the latch configured for engaging the connector assembly when assembly and the balancing resilient member comprising a predetermined resilient force that is greater than the friction force required for displacement of the ferrule within the ferrule sleeve.

Yet another aspect of the disclosure is directed to a fiber optic connector comprising a connector assembly comprising a housing, a ferrule and a resilient member for biasing the ferrule forward, a body for securing a portion of the connector assembly, an internal compliant member, a connector sleeve assembly, a balancing resilient member, and a female coupling housing. The internal compliant member is disposed about a barrel portion of the body and abutting a shoulder of the body. The connector sleeve assembly comprises a housing with a passageway between a first end and a second end along with a ferrule sleeve and a latch. When assembled, the connector assembly is at least partially disposed in a passageway of the connector sleeve assembly and the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve. The balancing resilient member for biasing the housing to a forward position with the latch configured for engaging the connector assembly when assembled and the balancing resilient member comprising a predetermined resilient force that is greater than the friction force required for displacement of the ferrule within the ferrule sleeve. The female coupling housing comprises an opening for receiving a complimentary connector.

Also disclosed are methods of assembling a fiber optic connector assembly comprising providing a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; providing a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; installing an internal compliant member about the barrel portion of the body and abutting the shoulder of the body; providing a connector sleeve assembly comprising a housing with a passageway between a first end and a second end, a ferrule and a latch; inserting the connector assembly at least partially into the passageway of the connector sleeve assembly and inserting the ferrule at least partially into the ferrule sleeve; installing a balancing resilient member for biasing the connector sleeve assembly to a forward position with the latch of the connector assembly engaging the connector assembly, wherein the biasing resilient member has a predetermined resilient force that is greater than the friction force required for displacing the ferrule within the ferrule sleeve; and assembling the connector sleeve assembly into a female coupling housing.

Additional features and advantages will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the same as described herein, including the detailed description that follows, the claims, as well as the appended drawings.

It is to be understood that both the foregoing general description and the following detailed description present embodiments that are intended to provide an overview or framework for understanding the nature and character of the claims. The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments and together with the description serve to explain the principles and operation.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1A-1C show portions of a conventional preconnectorized fiber drop cable having a hardened connector such as an OptiTap® male plug connector being inserted into and connected with a conventional receptacle for alignment and mating the hardened connector with a non-hardened connector;

FIG. 2 is a partially exploded view of a conventional receptacle such as depicted in FIGS. 1A-1C for mating a hardened connector with a non-hardened connector;

FIG. 3 is a partial-sectional view thru the outer housing of an explanatory fiber optic connector having a connector assembly, a connector sleeve assembly and a balancing resilient member according to the concepts disclosed herein;

FIG. 4 is an exploded view of the explanatory fiber optic connector of FIG. 3;

FIG. 5 is a partially exploded view of the explanatory fiber optic connector of FIG. 3;

FIG. 6 is a partially assembled view of a sub-assembly of the fiber optic connector of FIG. 3;

FIG. 7 is a sectional view of a sub-assembly of FIG. 6 showing further details;

FIGS. 8 and 9 depict further details of the housing and spring seat of the connector sleeve assembly of the sub-assembly of the fiber optic connector of FIGS. 16 and 17;

FIGS. 10-12 depict further details of the outer housing of the fiber optic connector of FIG. 3;

FIG. 13 is a partial-sectional view thru the outer housing of another explanatory fiber optic connector having a connector assembly, a connector sleeve assembly and a balancing resilient member according to the concepts disclosed herein, and which is mated to an OptiTap® male plug connector similar that shown in FIGS. 1A-1C;

FIG. 14 is a perspective view of cable assembly having another explanatory fiber optic connector according to the concepts disclosed;

FIG. 15 is an exploded view of cable assembly of FIG. 14;

FIG. 16 is an exploded view of the fiber optic connector of FIG. 14;

FIGS. 17-20 are partial assembly perspective views of the construction of the cable assembly of FIG. 14;

FIGS. 21 and 22 are exploded perspective views of the connector sleeve assembly of the fiber optic connector of cable assembly of FIGS. 14-16;

FIGS. 23 and 24 are front and rear perspective views of the assembled connector sleeve assembly of FIG. 14;

FIG. 25 is a sectional view of the assembled connector sleeve depicted in FIGS. 23 and 24;

FIG. 26 is a partial assembly perspective view of the cable assembly of FIG. 14 depicting the connector sleeve assembly attached to the connector assembly;

FIG. 27 is an end perspective view of the cable assembly of FIG. 14 with the dust cap removed;

FIG. 28 is a sectional view of the fiber optic connector of FIG. 14;

FIG. 29 is a perspective view of the cable assembly of FIG. 14 being aligned with a complimentary connector for mating;

FIGS. 30-33 depict another fiber optic connector having with a one-piece body that secures a portion of the fiber optic assembly; and

FIGS. 34-37 depict sectional views showing a representative female fiber optic connector as disclosed herein mating with complimentary male connector to illustrate movement of components and need for tolerance compensation using the internal resilient member.

DETAILED DESCRIPTION

Reference will now be made in detail to the embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, like reference numbers will be used to refer to like components or parts. The fiber optic connectors and cable assemblies described herein are suitable for making optical and/or optical-electrical connections (if electrical connections are included in the connectors) directly to a conventional male hardened plug connector. The fiber optic connectors disclosed comprise an internal compliant member disposed on an internal body of the female hardened fiber optic connector that secures or holds a portion of a connector assembly such as an SC connector assembly. The internal compliant member is used to compensate for the stack-up of parts that may comprise hard stops or movement in the axial direction during mating and can impact fiber optic connector performance. In addition to performance improvements, the use of the internal compliant member also improves manufacturing since it allows a larger tolerance range for the assemblies or parts that may be used in the fiber optic connector.

Although the concepts disclosed herein are explained with respect to a female hardened fiber optic connector used for optical connection with the male hardened plug connector an OptiTap® connector, the concepts disclosed may be used with other fiber optic connectors hardened or not and are not limited to this particular optical connection. As used herein, female hardened fiber optic connector means the connector directly receives another rugged connector such as a plug connector for a two-assembly optical connection (e.g., male to female) without the use of a receptacle or adapter for a three-assembly optical connection (e.g., male to male using receptacle or adapter).

The concepts of the disclosure advantageously allow robust and reliable optical connections using ferrule-based fiber optic connectors with an internal compliant member to compensate for tolerance stack-up of components. The fiber optic connector such as by balancing the ferrule retraction and inhibiting the loading-up of the ferrule displacement in the fiber optic connector that can occur during assembly and/or during mating, thereby avoiding undue optical attenuation.

FIGS. 3 and 4 depict a fiber optic connector 100 that comprises a connector assembly 52 that is fixed (i.e., inhibited from freely traveling) to the fiber optic connector such as fixed to a connector housing 164 of fiber optic connector 100 and the connector sleeve assembly 136 floats relative to the connector housing 164. In this case, the connector housing 164 comprises the internal threads for the female hardened connector as shown in FIG. 3. Having the connector assembly 52 “fixed” to the fiber optic connector means that the connector assembly is inhibited from traveling by a portion of the fiber optic connector such as an inner portion of the fiber optic connector like a retention body that may secure the connector assembly or the travel may be inhibited by an outer portion of the connector such as an outer housing depending on the construction of the connector.

Consequently, one concern with directly mating a male plug connection with a female fiber optic connector 100 is that the tolerance stack-up of components or of forces may cause issues with components of the connector arriving at undesired locations due to the tolerance stack-up of or forces on the components. Specifically, the stack-up of tolerances or of force may result in a condition that can displace ferrule sleeve to a hardstop in the connector sleeve assembly before being mated with the complimentary connector. Later when a mating connector is inserted into fiber optic connector 100 there can be optical performance issues that result since the connector sleeve, ferrule sleeve or other component is shifted beyond the desired location. For instance, since the ferrule sleeve is “loosely captive” within the housing of the connector sleeve assembly it may be “pushed” to the farthest point within the housing away from the inserted ferrule (i.e., to the far end where it awaits the complimentary mating ferrule). The ferrule sleeve will not move on its own from this position due to the static friction force between ferrule sleeve and ferrule of the connector assembly.

When the mating ferrules/ferrule sleeve are displaced from a generally centered position it may cause undue optical attenuation and/or other performance issues. For instance, the mating ferrule of the plug connector may be displaced by a distance than is greater than the design parameters of the plug connector being mated with the first fiber optic connector. Although the connectors may still be mated and operate; however, this uneven displacement of ferrules is undesirable and may cause elevated levels of optical attenuation, reduce reliability and/or cause other issues for the mated connectors.

It is noted that optical performance of a fiber optic connector may also depend on the fiber optic cable design being used. The hard stop between the mating connector housings (e.g., the female connector housing impacting or seating with the complementary male connector housing) and the connector sleeve assembly limits the amount of axial interference and determines the maximum extra optical fiber length generated in the connectors due to ferrule retraction. The ability to absorb extra optical fiber length in the connector may depend on many factors like the fiber optic cable construction, size of the cavity housing the optical fiber, but often is a relatively small value such as on the order of a few hundred microns and may impact optical performance.

The present application addresses these concerns by providing an internal compliant member disposed within the fiber optic connector to compensate for the tolerance stack-up of components and preserves optical performance. The internal compliant member may be compressed within the connector when needed to compensate for the tolerance stack-up of components such as when a connector assembly body bottoms-out (e.g., hits a hard stop) before a coupling nut is fully seated during mating of the connector with a plug connector, thereby allowing the continued tightening of the coupling nut while preserving optical performance. Further, it the internal compliant member is not needed it acts as a passive component during mating. Although, the internal compliant member may be a suitably sized O-ring other constructions or designs are possible for the internal compliant member such as a rubber or plastic washer or even felt material as desired.

The following female fiber optic connectors as shown for explanatory purposes and are suited for mating directly with a male connector such as an OptiTap plug connector similar that shown in FIGS. 1A-1C, without the use of the adapter. However, the female fiber optic connectors disclosed may have many different designs using the concepts of an internal compliant member as disclosed herein.

By way of description the fiber optic connector 100 depicted in FIGS. 3-5 is a first embodiment of an in-line female hardened connector, and FIGS. 6-12 are views of sub-assemblies or components of connector 100. FIGS. 13-16 depict another fiber optic connector 100′ in a second embodiment of an in-line female hardened connector according to the concepts disclosed herein with a simplified connector sleeve assembly, and FIGS. 17-26 are views of sub-assemblies or components of connector 100′. The simplified connector sleeve assembly uses fewer parts than the connector sleeve assembly of the first embodiment and results in fewer components that can contribute to the tolerance stack-up of components. FIGS. 27-29 depict a representative connector with a dust cap and the direct mating with a plug connector such as an OptiTap for an optical connection. FIGS. 30-33 depict yet another fiber optic connector using the disclosed concepts and having the simplified connector sleeve assembly with a one-piece body that has the internal compliant member thereon. Of course, other fiber optic connectors are possible using the concepts of the claims such as being use with other types of hardened connectors.

FIGS. 3 and 14 depict fiber optic connectors 100 and 200 being portions of respective cable assemblies further including a fiber optic cable 140 attached to the respective connectors. Fiber optic cable 140 may comprise one or more optical fibers, one or more tensile elements such as strength members or strength components, and a cable jacket, but other suitable components are possible. The tensile elements of fiber optic cable 140 are typically secured to a cable attachment region of fiber optic connector 100.

FIG. 3 is a partial-sectional view thru a housing 164 of an explanatory fiber optic connector 100 having a connector assembly 52, a body 155, an internal compliant member 156, a connector sleeve assembly 136 and one or more balancing resilient members 130 according to the concepts disclosed herein. FIGS. 4 and 5 respectively depict exploded views of the fiber optic connector 100. FIGS. 6 and 7 respectively depict a partial exploded view and an assembled view of a sub-assembly of fiber optic connector 100 to show further details of this embodiment.

FIG. 3 depicts fiber optic connector 100 having a dust cap 168 attached thereto via female coupling housing 164. The female coupling housing 164 is sized for receiving the male plug connector 5 within the front end opening for direct optical mating. Fiber optic connector 100 has a relatively small form factor and aligns the plug connector 5 in the proper orientation so it may only mates in one direction. Further, the optical coupling between the fiber optic connector 100 and the plug connector 5 is environmentally sealed. Additionally, fiber optic connector 100 may be optically coupled and uncoupled with plug connector 5 as desired.

Fiber optic connector 100 comprises connector assembly 52, a body 155 having at least one shell 155 a (as shown two shells 155 a that form the body), an optional crimp band 157, connector sleeve assembly 136, and female coupling housing 164. As best shown in FIGS. 6 and 7, the internal compliant member 156 is disposed about a barrel portion BP of the body and abutting a shoulder S of the body 155. Thus, the internal compliant member 156 may be compressed when needed between the shoulder S of the body and a portion of the female coupling housing 164. The barrel of the body may have any suitable shape as desired such as round, oval, rectangular, etc.

Fiber optic connector 100 may also comprise other optionally components such as a cable boot 166, a heat shrink tube 167, a second crimp band 153, and/or one or more O-rings. For complexity reduction and simplification, the fiber optic connector 100 can use many of the same parts as the OptiTap® plug connector 5 or other standard parts as desired; however, certain components are specific to fiber optic connector 100. By way of example, fiber optic connector 100 may comprise an industry standard SC type connector assembly 52 or the like having a connector assembly housing 52 a, a ferrule 52 b in a ferrule holder (not visible), a spring 52 c (not visible), and a spring push 52 d. However, any of the embodiments can use any suitable connector assembly such as a SC or a LC connector assembly having a ferrule and a connector housing along with other suitable components.

Although, the term body is shown with a crimp band the body does not require crimp or crimp band and may use other securing means such as adhesive or the like for securing the shells 155 a together. For instance, FIG. 19 shows a body that can snap together and/or be securing using an adhesive. Other embodiments of the body could also be a one-piece design. The crimp band 157 may also be used for securing the tensile elements of fiber optic cable 140 if desired. For instance, the tensile elements may be a plurality of tensile yarns attached between the outer barrel BP of body 155 and crimp band 157. In other embodiments, one or more strength components such as GRP rods maybe secured to the cable attachment region of the fiber optic connector such as between the shells 155 a. The optional second crimp band 153 may be used for cables or constructions where it is desired to strain-relieve the fiber optic cable directly to the connector assembly 52. By way of example, tensile elements such as aramid yarns may be secured to the connector assembly 52 using second crimp band 153 for providing strain-relief. Fiber optic connectors may also include a dust cap 168, but other suitable configurations are possible using fewer or more components. For instance, fiber optic connector 100 may also include an optional lanyard (not numbered) for the dust cap 168 as desired so it is prevented from being lost or separated from the assembly.

Generally speaking, most of the components of fiber optic connector 100 are formed from a suitable polymer, but other materials such as metal are possible. In one example, the polymer is a UV stabilized polymer such as ULTEM 2210 available from GE Plastics if the component is exposed to the elements; however, other suitable polymer materials are possible. For instance, stainless steel or any other suitable metal may be used for various components as desired.

The housing 133 of connector sleeve assembly 136 may be formed as a single component or formed as an assembly of more than one component. In this embodiment, the housing of 133 connector sleeve assembly 136 is formed from several components as best depicted in FIG. 7, thereby making the features of the connector sleeve easier manufacture, but the use of more components may increase the tolerance stack-up of parts. Of course, the concepts disclosed herein may be used with any suitable connector sleeve assembly. The housing 133 also includes latches 133 a for securing connector assembly 52, but the latches 133 a are not visible in the FIGS.

The housing 133 of connector sleeve assembly 136 has a through passageway from a first end 131 to a second end 132 for receiving ferrule sleeve 135 in a loosely captive manner and aligning respective ferrules of the fiber optic connector 100 and the mating connector as discussed herein. Specifically, when assembled, connector sleeve assembly 136 fits within female coupling housing 164 and is used for aligning ferrule 52 b of the fiber optic connector 100 with the corresponding ferrule of the plug connector 5. Connector sleeve assembly 136 comprises housing 133, ferrule sleeve 135, and a spring seat 137.

As depicted, ferrule sleeve 135 has a portion disposed within housing 133 and is secured therein by spring seat 137. Specifically, a flange (not numbered) of ferrule sleeve 135 is aligned to housing 133 using a recess portion of housing 133 and spring seat 137 is attached to the housing 133 for capturing and securing the flange of the ferrule sleeve 135 between the housing 133 and spring seat 137. In this embodiment, balancing resilient member 130 is a wave spring having one end seated on the spring seat 137 and the other end seated on the front portion of body 155 for biasing the housing 133 to a forward position. As best shown in FIGS. 6 and 7, a portion of the balancing resilient member 130 is disposed radially outward of the connector assembly 52 when the connector is assembled. However, other arrangements or configurations for the balancing resilient member are possible according to the concepts disclosed herein.

Fiber optic connectors 100 according to the concepts disclosed may also comprise a balancing resilient member 130 for biasing a housing 133 of a connector sleeve assembly 136 to a forward position. As used herein, “a forward position” is the direction pointing from a rear of the connector to the mating face of the fiber optic connector.

The biasing resilient member 130 has a predetermined resilient force that is greater than the friction force required for displacement of a ferrule 52 b of the connector assembly 52 within the ferrule sleeve 135 of the connector sleeve assembly 136 to provide a ferrule retraction balancing construction The details of use of the biasing resilient member 130 having a predetermined resilient force that is greater than the friction force required for displacement of a ferrule 52 b of the connector assembly 52 within the ferrule sleeve 135 is explained in more detail below.

Fiber optic connectors disclosed herein include a connector assembly 52 comprising a connector assembly housing 52 a, a ferrule 52 b and a resilient member 52 c. By way of example, and not limitation, suitable connector assemblies may include LC, SC along with other connector assemblies having a ferrule and ferrule sleeve arrangement as desired. Fiber optical connectors disclosed herein are advantageous for efficiently and economically streamlining the deployment and installation of fiber optic networks since they provide a robust and reliable operation.

The fiber optic connectors disclosed may also comprise a ferrule retraction balancing construction. The ferrule retraction balancing construction for fiber optic connectors 100 use one or more balancing resilient members 130 allows the housing 133 of the connector sleeve assembly 136 to translate axially toward the fiber optic connector housing 164 for a predetermined distance. This translation has the effect of moving the housing 133 relative to the ferrule sleeve 133, relieving a hard stop and allowing the ferrule 52 b of the connector assembly 52 to “balance” with the mating ferrule by permitting the springs 52 c of opposing connector assemblies 52 to react to one another essentially without the additional force vectors.

When the ferrule sleeve 135 is pushed to one side due to the ferrule sleeve overcoming the friction force, the one or more balancing resilient members 130 effectively acts as a stop formed inside the cavity and inhibits a worst-case scenario for ferrule displacement. The worst case ferrule displacement would occur if the force of the spring 52 c of connector assembly 52 and the friction of the ferrule sleeve both oppose the spring 252 c of the mating connector 200, which force difference would delegate the ferrule retraction and extra fiber accumulation to the mating connector 200. Thus, when the one or more balancing resilient members 130 having a predetermined resilient force that is greater than the friction force required for displacement of a ferrule 52 b of the connector assembly 52 within the ferrule sleeve 135, the worst-case scenario is inhibited and fiber optic connector performance is preserved.

Furthermore, the one or more balancing resilient members 130 may be selected to provide the predetermined resilient member force that is greater than the friction force required for displacement of the ferrule 52 b within ferrule sleeve 135 of fiber optic connector 100 for inhibiting a worst-case design scenario.

Moreover, the one or more balancing resilient members may take any suitable form such as a wave spring, a coil spring, leaf springs, etc. to provide the predetermined resilient force.

Moreover, different connector designs according to the concepts disclosed may have different force requirements for the balancing resilient member since the friction forces required for displacement of a ferrule within a ferrule sleeve may vary by the connector type. In one embodiment, the balancing resilient member 130 has a resilient member force of 2.5 Newton or greater, but other values are possible according to the concepts disclosed such as 5 Newton or greater or even 8 Newton or greater. By way of explanation, and not limitation, the friction force for a SC connector may be greater than the friction forces for an LC connector since the SC connector has a ferrule with a larger surface area in contact with the respective ferrule sleeve.

By way of example, if a ferrule has a diameter of about 2.5 millimeters such as in a SC connector assembly, then the balancing resilient member may have a predetermined resilient force of 5 Newton or greater. If a ferrule has a smaller diameter such as about 1.25 millimeter like used in a LC connector assembly, then the balancing resilient member may have a predetermined resilient force of 2.5 Newton or greater. These are explanatory examples and other values for the predetermined resilient force are possible.

In addition to the connector sleeve assembly 136 having a passageway 136 a between the first end 131 and the second end 132 it also includes one or more connector sleeve orientation features. Connector sleeve orientation features can have many different suitable constructions such as lugs, tabs, openings, etc. for cooperating with the one or more coupling housing orientation features on the female coupling housing. In the embodiment illustrated, connector sleeve assembly 136 includes a first lug 136 b and a second lug 136 c for fitting the connector sleeve assembly 136 into the female coupling housing 164. Stated another way, connector sleeve assembly 136 fits into female coupling housing 164 in only one orientation using first tab 136 b and second tab 136 c having different shapes as discussed below.

Connector sleeve assembly 136 optionally includes an orientation rail 139 (FIG. 8) for allowing connector assembly 52 of female hardened plug connector 150 to be assembled into the connector sleeve assembly 136 in only a single orientation. Orientation rail 139 has a profile that only allows a narrow end of connector body 52 a to abut the orientation rail 139 during assembly.

Housing 164 may have any suitable construction for the fiber optic connector using the concepts disclosed herein. As best shown in FIGS. 10-12, female coupling housing 164 has an elongate structure with a passageway 163 extending from the opening at a front end 161 to a rear end 162 and sized so that the shroud of the plug connector 5 fits into the front end 161 of passageway 163 when properly aligned. Consequently, plug connector 5 may be directly mated with the fiber optic connector 100 for making an optical connection therebetween. As shown, female coupling housing 164 includes a first portion at the front end that includes the internal attachment feature such as internal threads 165 that cooperate directly with the complimentary external threads of plug connector 5. Once the plug connector 5 is attached to the fiber optic connector 100 the assembly is suitable for making an optical connection therebetween.

Female coupling housing 164 includes features for aligning and securing connector sleeve assembly 136 along with alignment features for correctly orientating plug connector 5. In one embodiment, female coupling housing 164 includes a stop ledge 164 a integrally formed in a side wall (i.e., disposed on the side wall) that is disposed rearward of internal threads 165. Stop ledge 164 a is configured so that it only allows the shroud of plug connector 5 to fully seat within the female coupling housing 164 in one orientation for keying the optical coupling. In other words, the shroud of the plug connector 5 has alignment fingers having different shapes and the stop ledge 164 a only allows the plug connector 5 to fully seat for optical coupling in one orientation by preventing insertion of the larger alignment finger into the female coupling housing 164 past the stop ledge 164 a. Female coupling housing 164 also includes a shelf (not visible) within the passageway and disposed rearward of the stop ledge 164 a. Shelf 164 d has a complementary shape for receiving connector sleeve assembly 136 and includes a first retention feature 164 b and a second retention feature 164 c. Shelf 164 d has a generally rectangular shape that cooperates with the generally rectangular shape of connector sleeve assembly 136 so that it fits within the passageway of female coupling housing 164. First retention feature 164 b and second retention feature 164 c have different sizes that cooperate with tabs 136 b,136 c disposed on connector sleeve assembly 136 so that it may only fully seat into shelf 164 d in one orientation. Further, the stop ledge 164 a has a specific orientation relative to first retention feature 164 b and second retention feature 164 c.

When fully assembled the body 155 fits into female coupling housing 164 and is keyed to direct the insertion of the same into the coupling housing 164 in the correct orientation. In this case, shells 155 a include planar surfaces on opposite sides of body 155 to inhibit relative rotation between body 155 and female coupling housing 164. In other embodiments, the body 155 may be keyed to the female coupling housing 164 using other configurations such as a complementary protrusion/groove or the like.

Rear end 162 of housing 164 includes second portion (not numbered) having a reduced cross-section. The second portion is used for securing heat shrink tubing 167 for providing environmental protection between the housing 164 and the fiber optic cable 140 and weatherproofing the cable assembly. The other end of heat shrink tubing 167 is disposed about a portion of the cable jacket, thereby inhibiting water from entering fiber optic connector 100. Further, the second portion allows for the attachment of boot 166 to the rear end 162 of coupling housing 164. After the heat shrink tubing 167 is attached, boot 166 may be slid over heat shrink tubing 167. Specifically, boot 166 may be positioned over the shrink tubing 167 at rear end 162 of female coupling housing 164 for providing further bending strain relief for the cable assembly.

Boot 166 may be formed from a flexible material such as KRAYTON or the like. Heat shrink tubing 167 and boot 166 generally inhibit kinking and provide bending strain relief to the cable 140 near fiber optic connector 100. Boot 166 has a longitudinal passageway (not visible) and may have a stepped profile therethrough. The first end of the boot passageway is sized to fit over the heat shrink tubing 167. The first end of the boot passageway has a stepped down portion sized for cable 140 or other suitable cable that may be used and the heat shrink tubing 167 and acts as stop for indicating that the boot is fully seated. Dust cap 168 has external threads for engaging the internal threads of female coupling housing 164 for attachment and thereby inhibit dirt and debris from entering the fiber optic connector 100 via the front end 161 of female coupling housing 164. Moreover, the dust cap 168 may include an O-ring for providing a weatherproof seal between fiber optic connector 100 and dust cap 168 when installed.

FIG. 13 is a partial-sectional view thru the outer housing of another explanatory fiber optic connector 100′. Fiber optic connector 100′ is similar to connector 100 and comprises a connector assembly 52, a connector sleeve assembly 136 and a balancing resilient member 130 according to the concepts disclosed herein, but fiber optic connector 100′ has a construction that is different from fiber optic connector 100.

Specifically, fiber optic connector 100′ using a different body 155′ with a different fiber optic cable 140. Instead of the shells 155 a used in fiber optic connector 100, fiber optic connector 100′ has a monolithic body 155′ that has the fiber optic cable inserted into and secured using an adhesive. Additionally, the balancing resilient member 130 of fiber optic connector 100′ is configured as a coil spring that is seated on a portion of the fiber optic connect and housing 133 of connector sleeve assembly 136.

FIG. 13 depicts fiber optic connector 100′ mated directly to a plug connector 5 similar that shown in FIGS. 1A-1C without the use of adapter 30. As shown, the shroud of the male plug connector 5 has alignment fingers having different shapes and when mated the stop ledge only allows the plug connector 5 to fully seat for optical coupling in one orientation by preventing insertion of the larger alignment finger into the female coupling housing 164 past the stop ledge. In one embodiment, the correct mating orientation is marked on the female coupling housing 164 such as an alignment indicia so that the craftsman can quickly and easily mate fiber optic connector 100 with the plug connector 5. For instance, the alignment indicia may be an arrow or dot molded into the female coupling housing 164, however, other suitable indicia may be used. Thereafter, the craftsman engages the internal attachment feature 165 such as internal threads of female coupling housing 164 with the complimentary external threads of plug connector 5 for making the optical connection shown in FIG. 6.

Additionally, the optical connection is easily connected or disconnected by merely mating or unmating the plug connector 5 with the fiber optic connector 100 by threadly engaging or disengaging the coupling nut on the plug connector 5 with the attachment features 165 such as internal threads of the female coupling housing 164 of the fiber optic connector 100.

Other connector designs are possible according to the concepts disclosed for solving the issues of ferrule displacement by using a ferrule retraction balancing construction for fiber optic connectors by balancing out the forces related to the ferrule sleeve friction during assembly and mating. By way of example, FIG. 14 is a perspective view of a cable assembly 300 having another explanatory fiber optic connector 200 according to the concepts disclosed. Fiber optic connector 200 may use the same principals and concepts for the ferrule displacement balancing construction for inhibiting the loading-up of ferrule displacement within the fiber optic connector as discussed herein with respect to the other fiber optic connectors.

FIG. 15 is a partially exploded view of the cable assembly 300 having fiber optic connector 200 that is similar to fiber optic connector 100 and FIG. 16 is a partially exploded view of connector 200. Fiber optic connector 200 uses a different and simplified connector sleeve assembly 236 compared with connector 100. Fiber optic connector 200 also has other features or modified components that improve or simplify the manufacturing or assembly for fiber optic connector 200. For instance, a first shell 255 a and a second shell 255 b are designed so they can snap together and the crimp band 240 strain-relieves the fiber optic cable 140 to the spring push 52 d of connector assembly 52; instead of strain-relieving the fiber optic cable to the body 155. In other embodiments, portions of the cable may be strain-relieved to both the connector assembly 52 and the body if desired. Additionally, the female coupling housing 264 is different than female coupling housing 164 of fiber optic connector 100.

Fiber optic connector 200 comprises connector assembly 52, a connector sleeve assembly 236, a body 255, an internal compliant member disposed about a barrel portion of the body and abutting a shoulder, and a balancing resilient member 230 for biasing the housing of connector sleeve assembly 236 to a forward position along with a housing comprising a threaded portion. The balancing resilient member 230 may comprises a predetermined resilient force that is greater than the friction force required for the displacement of the ferrule 52 b within the ferrule sleeve 135 as discussed herein. Connector assembly 52 comprises a connector assembly housing 52 a, a ferrule 52 b and a resilient member (not visible) that is disposed within the connector assembly as known in the art.

FIGS. 17 and 18 are partial assembly perspective views showing a portion the construction of cable assembly 300. FIG. 17 is a perspective view depicting fiber optic cable 140 attached to connector assembly 52 and positioned in one shell 255 b. In this embodiment, cable 140 is secured to connector assembly 52 using a crimp band 240 that is attached to a portion of spring push 52 d. FIG. 18 depicts the second shell 255 a attached to the shell 255 b with the internal compliant member 256 disposed about the barrel portion BP of the body 255 and abutting the shoulder of the body 255. FIGS. 19 and 20 respectively are a partially exploded perspective view and assembled view of a portion of the construction of the fiber optic connector 200 with the internal compliant member 256 and biasing resilient member cable 230.

Cable assemblies may use any suitable fiber optic cables for the connector. However, different fiber optic cables 140 may require different structures for attaching and strain-relieving the cable. As discussed, fiber optic cable 140 may comprise one or more optical fibers, one or more tensile elements such as strength members or strength components, and a cable jacket, but other suitable components are possible. The tensile elements of fiber optic cable 140 (not shown) are typically secured to a cable attachment region of connector 200 or connector assembly 52. In this embodiment, the strength members of cable 140 such as aramid yarns, fiberglass yarns or the like are positioned about a rear portion of spring push 52 d and secured thereto using crimp band 240. However, cable 140 may be strain-relieved to connector 200 in other suitable manners depending on the cable design and connector components used. For instance, strength members or strength components may be secured to the body 255 such as by using a crimp band or an adhesive.

As shown in FIG. 18, connector 200 comprises a body 255 for securing the connector assembly 52 at a front end of one or more shells. In this embodiment, body 255 comprises a first shell 255 a and a second shell 255 b that cooperate to form the body 255. Shells 255 a and 255 b may be the same part or not depending on the desired construction for the connector. In this embodiment, shells 255 a,255 b each comprise a latch 255L and a catch 255C (FIG. 19) for securing the first and second shells together in a snap-fit construction for ease of assembly. Simply stated, the latch 255L of one shell cooperates with the catch 255C of the other shell and vice versa for securing the two shells together. Other configurations for shells 255 a,255 b are also possible such as securing the shells with a crimp band or adhesive as desired or required. Connector 200 may also comprise other optional components such as a cable boot 266, a heat shrink tube 267, a second crimp band, and/or one or more O-rings for sealing. For complexity reduction and simplification, the connector 200 can use many of the same parts as the OptiTap® plug connector 5 or other standard parts as desired; however, certain components may be specific to connector 200.

By way of explanation, other embodiments of body 255 may have the shells secured with a crimp band that is deformed about an outer barrel portion of the body 255. Further, the crimp band may also be used for securing the tensile elements of cable 140 to the outer barrel of the body 255. For instance, the tensile elements may be a plurality of tensile yarns attached between an outer barrel of body 255 and the crimp band. In other embodiments, one or more strength components such as GRP rods maybe secured to the cable attachment region of the fiber optic connector such as between the shells 255 a,255 b. Alternatively, two crimp bands may be used for cables or constructions where it is desired to strain-relieve the fiber optic cable directly to the connector assembly 52 and to body 255. By way of example, tensile elements such as aramid yarns may be secured to the connector assembly 52 as discussed herein and the second crimp band is used for strain-relieving tensile elements to the body 255. Connectors may also include a dust cap, but other suitable configurations are possible using fewer or more components. For instance, connector 200 may also include an optional lanyard (not numbered) for the dust cap as desired so it is prevented from being lost or separated from the assembly. Generally speaking, most of the components of fiber optic connector 200 are formed from a suitable polymer, but other materials such as metal are possible such as discussed herein.

FIGS. 21 and 22 are exploded perspective views of the connector sleeve assembly 236 of the fiber optic connector 200 and FIGS. 23 and 24 are front and rear perspective views of the assembled connector sleeve assembly 236. FIG. 25 is a sectional view of the connector sleeve assembly 236. Connector sleeve assembly 236 comprises housing 133 and the ferrule sleeve 135. In this embodiment, housing 133 is a simplified design that comprises a first portion 233 and a second portion 237. First portion 233 and second portion 237 cooperate to capture ferrule sleeve 135 therein. Housing 133 of connector 200 comprises a passageway between a first end and a second end and the ferrule sleeve 135 is disposed within the passageway. As discussed herein, ferrule sleeve 135 is “loosely captive” within the passageway of housing 133.

First portion 233 of housing 133 comprises one or more first protrusions 233P on a first side that extend from its flange (not numbered) toward the second portion 237 of the housing. First portion 233 of housing 133 also include one or more second protrusions 233P2 on a second side that extend from the flange of first portion 233. Protrusions 233P and 233P2 are used for rotationally aligning the connector assembly 52 of fiber optic connector 200 (using second protrusions) with the mating connector assembly (using first protrusions). Moreover, locating the first and second protrusions on the same component (e.g., first portion 233) allows for improved rotational registration between mating connector assemblies since the protrusions are dimensioned from the same component and there will not be relative rotation between the protrusions on the same component.

Second portion 237 of housing 133 comprises one or more windows or slots 237W formed in its flange (not numbered) that cooperate with the one or more protrusions 233P of the first portion 233. Specifically, the one or more first protrusions 233P of the first portion 233 align with the one or more windows or slots 237W of the second portion 237 for orienting the first portion 233 with the second portion 237. More specifically, the protrusions 233P and windows 237W have different shapes as shown that orient the connector assembly 52 with the connector sleeve assembly so the connector sleeve assembly may only attach to the connector assembly in one orientation. In other words, one of the protrusions 233P has an angular shape acting as an orientation rail 139 for cooperating and aligning with the asymmetric housing of connector assembly 52, thereby rotationally aligning the connector assembly 52 with the connector sleeve assembly 236 in only one orientation. Consequently, when the connector sleeve assembly 236 is attached to the connector assembly 52 the first lug 236 b and second lug 236 c of housing 133 have a specific arrangement with respect to the connector assembly 52 with the asymmetric housing. As depicted and discussed herein, the first lug and the second lugs have different shapes for orienting the connector sleeve assembly 236 with the female coupling housing 264.

As depicted, second portion 237 of housing 133 comprises attachment features for securing the second portion 237 with the first portion 233 of the housing and may be and suitable structure, fastener, adhesive or the like for securing the two portions together in a suitable fashion. Additionally, second portion 237 comprises one or more features for attaching the housing to the connector assembly 52. In this embodiment, the housing 133 of connector sleeve assembly 236 comprises one or more latch arms 237L that engage the connector ledge 52L. Latch arms 237L are configured for attaching the connector sleeve assembly 236 with the housing of connector assembly 52. Of course, other variations of the connector sleeve assembly are possible using the concepts disclosed herein.

As best shown in FIG. 25, the simplified connector sleeve assembly 236 reduces the tolerance stack-up since only two parts are used for housing. In other words, connector sleeve assembly 236 provides a width W plus its tolerance ±T that is accounted for in the tolerance stack-up for fiber optic connector 200 during mating. Consequently, the tolerance attributed to a width W of the housing in the direction of the mating is easier to control during design and manufacture of the connector compared with a stack-up of tolerance for connector sleeve assemblies having more than two components.

FIG. 26 shows a partial assembly of fiber optic connector 200 before the housing 264 is installed. Specifically, FIG. 26 depicts the connector sleeve assembly 236 attached to the connector assembly 52 during the construction of the connector 200. As shown, the connector sleeve assembly 236 comprises a latch, and the balancing resilient member 230 biases the connector sleeve assembly 236 forward with the latch engaging the connector assembly 52 when assembled. Before attaching, the connector sleeve assembly 236 to the connector assembly 52, the balancing resilient member 230 is disposed radially outward of the connector assembly and then the parts are attached together by snap-fitting or the like. The balancing resilient member 230 contacts a portion of the connector sleeve assembly 236 as shown. Balancing resilient member may have any suitable predetermined resilient force as discussed herein.

In other embodiments, the housing 133 of connector sleeve assembly 136 may be formed as a single component as shown or formed as an assembly of more than one component. However, the concepts disclosed herein may be used with any suitable connector sleeve assembly such as having a housing comprising several components if desired.

FIG. 27 is an end perspective view of the cable assembly 300 with the dust cap 168 removed from fiber optic connector 200. Female coupling housing 264 of connector 200 may have any suitable construction for the fiber optic connector using the concepts disclosed herein. The female coupling housing 264 is sized for receiving the male plug connector 5 within the front end opening 161 for direct optical mating. Fiber optic connector 200 has a relatively small form factor and aligns the plug connector 5 in the proper orientation so it may only mates in one direction. Further, the optical coupling between the connector 200 and the plug connector 5 is environmentally sealed. Additionally, fiber optic connector 200 may be optically coupled and uncoupled with plug connector 5 as desired.

As best shown in FIGS. 15 and 27, female coupling housing 264 has an elongate structure with a passageway 263 extending from the opening at a front end 261 to a rear end 162 and sized so that the shroud of the plug connector 5 fits into the front end 261 of passageway 263 when properly aligned. The female coupling housing 264 comprises an opening for receiving a complimentary connector. Consequently, plug connector 5 may be directly mated with the fiber optic connector 200 for making an optical connection therebetween. As shown, female coupling housing 264 includes a first portion at the front end that includes the internal attachment feature such as internal threads 265 that cooperate directly with the complimentary external threads of plug connector 5. Once the plug connector 5 is attached to the fiber optic connector 200 the assembly is suitable for making an optical connection therebetween.

Female coupling housing 264 includes features for aligning and securing connector sleeve assembly 236 along with alignment features for correctly orientating plug connector 5. In one embodiment, female coupling housing 264 includes a stop ledge 264 a integrally formed in a side wall (i.e., disposed on the side wall) that is disposed rearward of internal threads 265. Stop ledge 264 a is configured so that it only allows the shroud of plug connector 5 to fully seat within the female coupling housing 264 in one orientation for keying the optical coupling. In other words, the shroud of the plug connector 5 has alignment fingers having different shapes and the stop ledge 264 a only allows the plug connector 5 to fully seat for optical coupling in one orientation by preventing insertion of the larger alignment finger into the female coupling housing 264 past the stop ledge 264 a. Female coupling housing 264 also comprises a first retention feature 264 b and a second retention feature 264 c (not visible). First retention feature 264 b and second retention feature 264 c have different sizes that cooperate with lugs or tabs 236 b,236 c disposed on connector sleeve assembly 236 so that it may only fully seat into the female coupling housing 264 in one orientation. Further, the stop ledge 264 a has a specific orientation relative to first retention feature 264 b and second retention feature 264 c.

FIG. 28 depicts an assembled view of fiber optic connector 200 with the dust cap 168 attached. When fully assembled the body 255 fits into female coupling housing 164 and may be keyed to direct the insertion of the same into the coupling housing 264 in the correct orientation. In this case, shells 255 a, 255 b include planar surfaces on opposite sides of body 255 to inhibit relative rotation between body 255 and female coupling housing 264. In other embodiments, the body 255 may be keyed to the female coupling housing 264 using other configurations such as a complementary protrusion/groove or the like.

The rear end of housing 264 includes second portion (not numbered) having a reduced cross-section. The second portion is used for securing heat shrink tubing 267 (the heat shrink tubing is depicted in the shrunk form) for providing environmental protection between the housing 264 and the fiber optic cable 140 and weatherproofing the cable assembly. The other end of heat shrink tubing 267 is disposed about a portion of the cable, thereby inhibiting water from entering connector 200. Further, the second portion allows for the attachment of boot 266 to the rear end of the female coupling housing 264. After the heat shrink tubing 267 is attached, boot 266 may be slid over heat shrink tubing 267. Specifically, boot 266 may be positioned over the shrink tubing 267 at rear end 262 of female coupling housing 264 for providing further bending strain relief for the cable assembly.

As discussed, boot 266 may be formed from a flexible material such as KRAYTON or the like. Heat shrink tubing 267 and boot 266 generally inhibit kinking and provide bending strain relief to the cable 140 near connector 200. Boot 266 has a longitudinal passageway (not visible) and may have a stepped profile therethrough. Dust cap 268 has external threads for engaging the internal threads of female coupling housing 264 for attachment and thereby inhibit dirt and debris from entering the connector 200 via the front end 261 of female coupling housing 264 when not mated. Moreover, the dust cap 268 may include an O-ring for providing a weatherproof seal between fiber optic connector 200 and dust cap 268 when installed. The O-ring of a dust cap that seals the opening of the connector when not in a mated state should not be confused with the internal compliant member 256 that aids in tolerance stack-up of components in the connector.

FIG. 29 is a perspective view of the cable assembly 200 being aligned with a complimentary plug connector 5 for mating. As shown, the shroud of the male plug connector 5 has alignment fingers having different shapes and when mated the female coupling housing 264 only allows the plug connector 5 to fully seat for optical coupling in one orientation by preventing insertion of the larger alignment finger into the female coupling housing 264 past the stop ledge. In one embodiment, the correct mating orientation is marked on the female coupling housing 264 such as an alignment indicia so that the craftsman can quickly and easily mate connector 200 with the plug connector 5. For instance, the alignment indicia may be an arrow or dot molded into the female coupling housing 264, however, other suitable indicia may be used. Thereafter, the craftsman engages the internal attachment feature 265 such as internal threads of female coupling housing 264 with the complimentary external threads of plug connector 5 for making the optical connection.

Additionally, the optical connection is easily connected or disconnected by merely mating or unmating the plug connector 5 with the fiber optic connector 200 by threadly engaging or disengaging the coupling nut on the plug connector 5 with the attachment features 265.

FIGS. 30-33 depict another fiber optic connector 200′ similar to fiber optic connector 200 but having with a one-piece body 355 with the internal compliant member 256 disposed thereon. Like connector 200, fiber optic connector 200′ comprises connector assembly 52, body 355 for securing a portion of the connector assembly 52, an internal compliant member 256 disposed about a barrel portion of body 355 and abutting a shoulder of the body, connector sleeve assembly 236, balancing resilient member 230 and housing 264 comprising a threaded portion as depicted in FIGS. 30-33.

FIGS. 34-37 depict schematic sectional views showing a representative fiber optic connector as disclosed herein mating along with complimentary connector to illustrate movement of components and tolerance compensation using the internal resilient member for a worse-case scenario. FIG. 34 is a schematic representation of the female fiber optic connector on the right-side according to the concepts disclosed herein receiving a male connector such as an OptiTap connector 5 from the left-side as represented by the arrows. FIG. 35 shows the connector 5 inserted into the female fiber optic connector until the mating ferrules between the connectors make contact. As the connector 5 is inserted the engagement from the ferrule displaces the ferrule sleeve to the far right in the housing of the connector sleeve assembly leaving the gap between ferrule sleeve and the housing as depicted by the circles; however, the connector 5 has not yet reached full insertion into the female connector housing. FIG. 36 depicts further insertion of connector 5 that further pushes the ferrule assembly rearward against it biasing spring (as represented by the middle circles) until the connector assembly contacts the hardstop of the housing of the connector sleeve assembly (as shown by the circles on the far-right); however, the connector 5 has not yet reached full insertion into the housing of the female connector (as represented by the circles on the far-left). At this point, the coupling nut of connector 5 can still be tightened until the hardstop such as the shroud of connector 5 contacts the housing of the female connector as shown in the far-right circles of FIG. 37. It is at this point the connector assembly of the female connector hits a hardstop and the coupling nut of connector 5 is not yet fully-tightened so that the internal compliant member 256 may be compressed upon further tightening of the coupling nut of connector 5 to compensate for any needed stack-up of the tolerances of the components during mating.

Although the disclosure has been illustrated and described herein with reference to explanatory embodiments and specific examples thereof, it will be readily apparent to those of ordinary skill in the art that other embodiments and examples can perform similar functions and/or achieve like results. All such equivalent embodiments and examples are within the spirit and scope of the disclosure and are intended to be covered by the appended claims. It will also be apparent to those skilled in the art that various modifications and variations can be made to the concepts disclosed without departing from the spirit and scope of the same. Thus, it is intended that the present application cover the modifications and variations provided they come within the scope of the appended claims and their equivalents. 

We claim:
 1. A fiber optic connector, comprising: a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; an internal compliant member, the internal compliant member disposed about the barrel portion of the body and abutting the shoulder of the body; a connector sleeve assembly comprising a housing with a passageway between a first end and a second end and a ferrule sleeve, and the housing having one or more features configured for attaching to the connector assembly, wherein the ferrule of the connector assembly is at least partially disposed in the ferrule sleeve when assembled; a balancing resilient member for biasing the housing to a forward position; and a housing comprising a threaded portion.
 2. The fiber optic connector of claim 1, wherein the internal compliant member comprises an O-ring.
 3. The fiber optic connector of claim 1, wherein the balancing resilient member comprises a predetermined resilient force that is greater than the friction force required for displacement of the ferrule within the ferrule sleeve, and the predetermined resilient force is 2.5 Newton or greater when assembled.
 4. The fiber optic connector of claim 1, wherein the ferrule has a diameter of about 2.5 millimeters and the predetermined resilient force is 5 Newton or greater.
 5. The fiber optic connector of claim 1, wherein the ferrule has a diameter of about 1.25 millimeters and the predetermined resilient force is 2.5 Newton or greater.
 6. The fiber optic connector of claim 1, wherein the connector sleeve assembly comprises a latch, and the balancing resilient member biases the connector sleeve assembly forward with the latch engaging the connector assembly when assembled.
 7. The fiber optic connector of claim 1, wherein a portion of the balancing resilient member is disposed radially outward of the connector assembly.
 8. The fiber optic connector of claim 1, further comprising a stop for the connector sleeve assembly.
 9. The fiber optic connector of claim 1, wherein the assembled fiber optic connector comprises a portion of the balancing resilient member contacting a portion of the connector sleeve assembly.
 10. The fiber optic connector of claim 1, wherein the housing of the connector sleeve assembly comprises a first portion and a second portion, wherein the first portion comprises one or more first protrusions on a first side for alignment and one or more second protrusions on a second side for alignment.
 11. The fiber optic connector of claim 1, the connector assembly further comprising a ferrule holder and wherein the resilient member of the connector assembly biases the ferrule holder and the ferrule forward when assembled.
 12. The fiber optic connector of claim 1, wherein the housing comprises a female coupling housing comprising an opening for receiving a complimentary connector.
 13. The fiber optic connector of claim 1, the connector assembly further comprising a housing and the connector assembly being an SC connector assembly.
 14. The fiber optic connector of claim 1, further comprising a crimp band.
 15. The fiber optic connector of claim 1 being a portion of a cable assembly further comprising a fiber optic cable attached to the fiber optic connector.
 16. The fiber optic connector of claim 15, wherein the fiber optic cable further comprises strength members secured to a cable attachment region.
 17. The fiber optic connector of claim 15, further comprising a tensile element of the fiber optic cable being a plurality of tensile yarns attached between an outer barrel of the body and a crimp band or one or more strength components disposed between a first shell and a second shell of the body.
 18. The fiber optic connector of claim 15, further comprising a first shell and a second shell that are secured using a crimp band and/or an adhesive.
 19. The fiber optic connector of claim 15, wherein the fiber optic cable has an optical fiber having a buffer layer with a portion disposed in the body and the connector assembly.
 20. The fiber optic connector of claim 15, wherein the cable assembly further includes a boot.
 21. A fiber optic connector, comprising: a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; an internal compliant member, the internal compliant member disposed about the barrel portion of the body and abutting the shoulder of the body; a connector sleeve assembly comprising a housing with one or more features configured for attaching to the connector assembly and a passageway between a first end and a second end and a ferrule sleeve, wherein the ferrule is at least partially disposed in the ferrule sleeve when assembled; a balancing resilient member for biasing the connector sleeve assembly to a forward position; and a housing comprising a threaded portion, wherein the threaded portion comprises internal threads on the housing.
 22. The fiber optic connector of claim 21, wherein the internal compliant member comprises an O-ring.
 23. The fiber optic connector of claim 21, wherein the balancing resilient member comprises a predetermined resilient force that is 5 Newton or greater, and the ferrule has a diameter of about 2.5 millimeters.
 24. The fiber optic connector of claim 21, wherein the ferrule has a diameter of about 1.25 millimeters.
 25. The fiber optic connector of claim 21, wherein the connector sleeve assembly comprises a latch, and the balancing resilient member biases the connector sleeve assembly forward with the latch engaging the connector assembly when assembled.
 26. The fiber optic connector of claim 21, wherein a portion of the balancing resilient member is disposed radially outward of the connector assembly.
 27. The fiber optic connector of claim 21, wherein the housing of the connector sleeve assembly comprises a first portion and a second portion, wherein the first portion comprises one or more first protrusions on a first side for alignment and one or more second protrusions on a second side for alignment.
 28. The fiber optic connector of claim 21, further comprising a stop for the connector sleeve assembly.
 29. The fiber optic connector of claim 21, wherein a portion of the balancing resilient member contacts the connector sleeve assembly.
 30. The fiber optic connector of claim 21, the connector assembly further comprising a ferrule holder and the resilient member of the connector assembly biasing the ferrule holder and the ferrule forward.
 31. The fiber optic connector of claim 21, wherein the housing comprises a female coupling housing comprising an opening for receiving a complimentary connector.
 32. The fiber optic connector of claim 21, wherein the connector assembly is an SC connector assembly.
 33. The fiber optic connector of claim 21, further comprising a crimp band.
 34. The fiber optic connector of claim 21, being a portion of a cable assembly further comprising a fiber optic cable attached to the fiber optic connector.
 35. The fiber optic connector of claim 34, wherein the fiber optic cable includes strength members secured to a cable attachment region.
 36. The fiber optic connector of claim 34, further comprising a tensile element of the fiber optic cable being a plurality of tensile yarns attached between an outer barrel of the body and a crimp band or one or more strength components disposed between a first shell and a second shell of the body.
 37. The fiber optic connector of claim 34, wherein the fiber optic connector further comprises a first shell and a second shell that are secured using a crimp band and/or an adhesive.
 38. The fiber optic connector of claim 34, wherein the fiber optic cable has an optical fiber having a buffer layer that enters the body and enters the connector assembly.
 39. The fiber optic connector of claim 34, the cable assembly further comprises a boot.
 40. A fiber optic connector, comprising: a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; an internal compliant member, the internal compliant member disposed about the barrel portion of the body and abutting the shoulder of the body; a connector sleeve assembly comprising a housing with one or more latch arms and a passageway between a first end and a second end, and a ferrule sleeve, wherein the ferrule is at least partially disposed in the ferrule sleeve when assembled; a balancing resilient member for biasing the connector sleeve assembly to a forward position and the one or more latch arms configured for engaging the connector assembly when assembled, and the balancing resilient member comprising a predetermined resilient force that is greater than the friction force required for displacing the ferrule within the ferrule sleeve; and a female coupling housing comprising an opening having a threaded portion.
 41. A fiber optic connector, comprising: a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; an internal compliant member, the internal compliant member disposed about the barrel portion of the body and abutting the shoulder of the body; a connector sleeve assembly comprising a housing comprising one or more latch arms and a passageway between a first end and a second end of the housing, and a ferrule sleeve, wherein the ferrule is at least partially disposed in the ferrule sleeve when assembled; a balancing resilient member for biasing the connector sleeve assembly to a forward position and the one or more latch arms configured for engaging the connector assembly when assembled, and the balancing resilient member being disposed radially outward of the connector assembly and comprising a predetermined resilient force that is greater than the friction force required for displacing the ferrule within the ferrule sleeve; and a female coupling housing comprising an opening for receiving a complimentary connector.
 42. The fiber optic connector of claim 41, wherein the internal compliant member comprises an O-ring.
 43. The fiber optic connector of claim 41, wherein the predetermined resilient force is 2.5 Newton or greater.
 44. The fiber optic connector of claim 41, wherein the ferrule has a diameter of about 2.5 millimeters and the predetermined resilient force is 5 Newton or greater.
 45. The fiber optic connector of claim 41, wherein the ferrule has a diameter of about 1.25 millimeters and the predetermined resilient force is 2.5 Newton or greater.
 46. The fiber optic connector of claim 41, further comprising an orientation rail.
 47. A method of assembling a fiber optic connector, comprising: providing a connector assembly comprising a connector assembly housing, a ferrule and a resilient member for biasing the ferrule forward; providing a body for securing a portion of the connector assembly, the body comprising a barrel portion and a shoulder; installing an internal compliant member disposed about the barrel portion of the body and abutting the shoulder of the body; providing a connector sleeve assembly comprising a housing with a passageway between a first end and a second end, a ferrule sleeve and one or more latch arms; inserting the connector assembly at least partially into the passageway of the connector sleeve assembly and the ferrule at least partially into the ferrule sleeve; installing a balancing resilient member for biasing the connector sleeve assembly to a forward position with the latch of the connector assembly engaging the connector assembly, wherein the balancing resilient member has a predetermined resilient force that is greater than the friction force required for displacing the ferrule within the ferrule sleeve; and assembling the connector sleeve assembly into a female coupling housing.
 48. The method of claim 47, wherein the internal compliant member comprises an O-ring. 